:::. Sendmail & WorkAroundBrokenAAAA.

[Mikhail Goriachev]

David Robillard wrote:
>> Thanks for looking into this. I just realised that the domain in
>> question got fixed overnight after notifying the sysadmin. I guess this
>> is a good thing, yet I'm left puzzled with the difference between
>> confBIND_OPTS option and compiled INET6 support.
> 
> Hello Mikhail,
> 
> The difference is rather simple. The sendmail program will look up
> AAAA records only if it is built with the NETINET6 compile-time macro
> defined. If so, it looks up AAAA records first, then A records.
> 
> Thus, if sendmail is not compiled for IPv6, then the resolver will
> never query AAAA records. Hence there will never have a problem
> related to the WorkAroundBrokenAAAA.
> 
> See 24.9.91 as "ResolverOptions" and 9.2.7 as "Broken IPv6 Name
> Servers" in the sendmail book by O'Reilly (the so called Bat Book
> ISBN: 1-56592-839-3)


I actually came across someone on the net mentioning that book and
related IPv6 problems. This is where I got the idea of recompiling
sendmail without INET6 support.


> The book recommends the following if you find a broken Name Server:
> 
> a) Notifiy the hostmaster running the broken name server. The sooner
> the broken name servers are fixed, the cleaner the internet will run.


Yep, did that and it got fixed.


> b) Add the define(`confBIND_OPTS', `+WorkAroundBrokenAAAA')dnl into
> your sendmail.mc file.


I tried that and it didn't work for me. That is why I started this
thread. That line should've fixed my problem but nothing happened. I
noticed you have an extra '+' in your line. I was using:

define(`confBIND_OPTS', `WorkAroundBrokenAAAA')dnl

Not sure if that would've made any difference.


Thanks for your input David.


> Regards,
> 
> David
> 


-- 
Mikhail Goriachev
Webanoide

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